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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Part III.  Extensions</title><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><meta name="keywords" content="ISO C++, library" /><meta name="keywords" content="ISO C++, runtime, library" /><link rel="home" href="../index.html" title="The GNU C++ Library" /><link rel="up" href="index.html" title="The GNU C++ Library Manual" /><link rel="prev" href="concurrency.html" title="Chapter 15.  Concurrency" /><link rel="next" href="ext_preface.html" title="" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Part III. 
  Extensions
  
</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="concurrency.html">Prev</a> </td><th width="60%" align="center">The GNU C++ Library Manual</th><td width="20%" align="right"> <a accesskey="n" href="ext_preface.html">Next</a></td></tr></table><hr /></div><div class="part"><div class="titlepage"><div><div><h1 class="title"><a id="manual.ext"></a>Part III. 
  Extensions
  <a id="id-1.3.5.1.1.1" class="indexterm"></a>
</h1></div></div></div><div class="toc"><p><strong>Table of Contents</strong></p><dl class="toc"><dt><span class="preface"><a href="ext_preface.html"></a></span></dt><dt><span class="chapter"><a href="ext_compile_checks.html">16. Compile Time Checks</a></span></dt><dt><span class="chapter"><a href="debug_mode.html">17. Debug Mode</a></span></dt><dd><dl><dt><span class="section"><a href="debug_mode.html#manual.ext.debug_mode.intro">Intro</a></span></dt><dt><span class="section"><a href="debug_mode_semantics.html">Semantics</a></span></dt><dt><span class="section"><a href="debug_mode_using.html">Using</a></span></dt><dd><dl><dt><span class="section"><a href="debug_mode_using.html#debug_mode.using.mode">Using the Debug Mode</a></span></dt><dt><span class="section"><a href="debug_mode_using.html#debug_mode.using.specific">Using a Specific Debug Container</a></span></dt></dl></dd><dt><span class="section"><a href="debug_mode_design.html">Design</a></span></dt><dd><dl><dt><span class="section"><a href="debug_mode_design.html#debug_mode.design.goals">Goals</a></span></dt><dt><span class="section"><a href="debug_mode_design.html#debug_mode.design.methods">Methods</a></span></dt><dd><dl><dt><span class="section"><a href="debug_mode_design.html#debug_mode.design.methods.wrappers">The Wrapper Model</a></span></dt><dd><dl><dt><span class="section"><a href="debug_mode_design.html#debug_mode.design.methods.safe_iter">Safe Iterators</a></span></dt><dt><span class="section"><a href="debug_mode_design.html#debug_mode.design.methods.safe_seq">Safe Sequences (Containers)</a></span></dt></dl></dd><dt><span class="section"><a href="debug_mode_design.html#debug_mode.design.methods.precond">Precondition Checking</a></span></dt><dt><span class="section"><a href="debug_mode_design.html#debug_mode.design.methods.coexistence">Release- and debug-mode coexistence</a></span></dt><dd><dl><dt><span class="section"><a href="debug_mode_design.html#methods.coexistence.compile">Compile-time coexistence of release- and debug-mode components</a></span></dt><dt><span class="section"><a href="debug_mode_design.html#methods.coexistence.link">Link- and run-time coexistence of release- and
    debug-mode components</a></span></dt><dt><span class="section"><a href="debug_mode_design.html#methods.coexistence.alt">Alternatives for Coexistence</a></span></dt></dl></dd></dl></dd><dt><span class="section"><a href="debug_mode_design.html#debug_mode.design.other">Other Implementations</a></span></dt></dl></dd></dl></dd><dt><span class="chapter"><a href="parallel_mode.html">18. Parallel Mode</a></span></dt><dd><dl><dt><span class="section"><a href="parallel_mode.html#manual.ext.parallel_mode.intro">Intro</a></span></dt><dt><span class="section"><a href="parallel_mode_semantics.html">Semantics</a></span></dt><dt><span class="section"><a href="parallel_mode_using.html">Using</a></span></dt><dd><dl><dt><span class="section"><a href="parallel_mode_using.html#parallel_mode.using.prereq_flags">Prerequisite Compiler Flags</a></span></dt><dt><span class="section"><a href="parallel_mode_using.html#parallel_mode.using.parallel_mode">Using Parallel Mode</a></span></dt><dt><span class="section"><a href="parallel_mode_using.html#parallel_mode.using.specific">Using Specific Parallel Components</a></span></dt></dl></dd><dt><span class="section"><a href="parallel_mode_design.html">Design</a></span></dt><dd><dl><dt><span class="section"><a href="parallel_mode_design.html#parallel_mode.design.intro">Interface Basics</a></span></dt><dt><span class="section"><a href="parallel_mode_design.html#parallel_mode.design.tuning">Configuration and Tuning</a></span></dt><dd><dl><dt><span class="section"><a href="parallel_mode_design.html#parallel_mode.design.tuning.omp">Setting up the OpenMP Environment</a></span></dt><dt><span class="section"><a href="parallel_mode_design.html#parallel_mode.design.tuning.compile">Compile Time Switches</a></span></dt><dt><span class="section"><a href="parallel_mode_design.html#parallel_mode.design.tuning.settings">Run Time Settings and Defaults</a></span></dt></dl></dd><dt><span class="section"><a href="parallel_mode_design.html#parallel_mode.design.impl">Implementation Namespaces</a></span></dt></dl></dd><dt><span class="section"><a href="parallel_mode_test.html">Testing</a></span></dt><dt><span class="bibliography"><a href="parallel_mode.html#parallel_mode.biblio">Bibliography</a></span></dt></dl></dd><dt><span class="chapter"><a href="mt_allocator.html">19. The mt_allocator</a></span></dt><dd><dl><dt><span class="section"><a href="mt_allocator.html#allocator.mt.intro">Intro</a></span></dt><dt><span class="section"><a href="mt_allocator_design.html">Design Issues</a></span></dt><dd><dl><dt><span class="section"><a href="mt_allocator_design.html#allocator.mt.overview">Overview</a></span></dt></dl></dd><dt><span class="section"><a href="mt_allocator_impl.html">Implementation</a></span></dt><dd><dl><dt><span class="section"><a href="mt_allocator_impl.html#allocator.mt.tune">Tunable Parameters</a></span></dt><dt><span class="section"><a href="mt_allocator_impl.html#allocator.mt.init">Initialization</a></span></dt><dt><span class="section"><a href="mt_allocator_impl.html#allocator.mt.deallocation">Deallocation Notes</a></span></dt></dl></dd><dt><span class="section"><a href="mt_allocator_ex_single.html">Single Thread Example</a></span></dt><dt><span class="section"><a href="mt_allocator_ex_multi.html">Multiple Thread Example</a></span></dt></dl></dd><dt><span class="chapter"><a href="bitmap_allocator.html">20. The bitmap_allocator</a></span></dt><dd><dl><dt><span class="section"><a href="bitmap_allocator.html#allocator.bitmap.design">Design</a></span></dt><dt><span class="section"><a href="bitmap_allocator_impl.html">Implementation</a></span></dt><dd><dl><dt><span class="section"><a href="bitmap_allocator_impl.html#bitmap.impl.free_list_store">Free List Store</a></span></dt><dt><span class="section"><a href="bitmap_allocator_impl.html#bitmap.impl.super_block">Super Block</a></span></dt><dt><span class="section"><a href="bitmap_allocator_impl.html#bitmap.impl.super_block_data">Super Block Data Layout</a></span></dt><dt><span class="section"><a href="bitmap_allocator_impl.html#bitmap.impl.max_wasted">Maximum Wasted Percentage</a></span></dt><dt><span class="section"><a href="bitmap_allocator_impl.html#bitmap.impl.allocate"><code class="function">allocate</code></a></span></dt><dt><span class="section"><a href="bitmap_allocator_impl.html#bitmap.impl.deallocate"><code class="function">deallocate</code></a></span></dt><dt><span class="section"><a href="bitmap_allocator_impl.html#bitmap.impl.questions">Questions</a></span></dt><dd><dl><dt><span class="section"><a href="bitmap_allocator_impl.html#bitmap.impl.question.1">1</a></span></dt><dt><span class="section"><a href="bitmap_allocator_impl.html#bitmap.impl.question.2">2</a></span></dt><dt><span class="section"><a href="bitmap_allocator_impl.html#bitmap.impl.question.3">3</a></span></dt></dl></dd><dt><span class="section"><a href="bitmap_allocator_impl.html#bitmap.impl.locality">Locality</a></span></dt><dt><span class="section"><a href="bitmap_allocator_impl.html#bitmap.impl.grow_policy">Overhead and Grow Policy</a></span></dt></dl></dd></dl></dd><dt><span class="chapter"><a href="policy_data_structures.html">21. Policy-Based Data Structures</a></span></dt><dd><dl><dt><span class="section"><a href="policy_data_structures.html#pbds.intro">Intro</a></span></dt><dd><dl><dt><span class="section"><a href="policy_data_structures.html#pbds.intro.issues">Performance Issues</a></span></dt><dd><dl><dt><span class="section"><a href="policy_data_structures.html#pbds.intro.issues.associative">Associative</a></span></dt><dt><span class="section"><a href="policy_data_structures.html#pbds.intro.issues.priority_queue">Priority Que</a></span></dt></dl></dd><dt><span class="section"><a href="policy_data_structures.html#pbds.intro.motivation">Goals</a></span></dt><dd><dl><dt><span class="section"><a href="policy_data_structures.html#pbds.intro.motivation.associative">Associative</a></span></dt><dd><dl><dt><span class="section"><a href="policy_data_structures.html#motivation.associative.policy">Policy Choices</a></span></dt><dt><span class="section"><a href="policy_data_structures.html#motivation.associative.underlying">Underlying Data Structures</a></span></dt><dt><span class="section"><a href="policy_data_structures.html#motivation.associative.iterators">Iterators</a></span></dt><dt><span class="section"><a href="policy_data_structures.html#motivation.associative.functions">Functional</a></span></dt></dl></dd><dt><span class="section"><a href="policy_data_structures.html#pbds.intro.motivation.priority_queue">Priority Queues</a></span></dt><dd><dl><dt><span class="section"><a href="policy_data_structures.html#motivation.priority_queue.policy">Policy Choices</a></span></dt><dt><span class="section"><a href="policy_data_structures.html#motivation.priority_queue.underlying">Underlying Data Structures</a></span></dt><dt><span class="section"><a href="policy_data_structures.html#motivation.priority_queue.binary_heap">Binary Heaps</a></span></dt></dl></dd></dl></dd></dl></dd><dt><span class="section"><a href="policy_data_structures_using.html">Using</a></span></dt><dd><dl><dt><span class="section"><a href="policy_data_structures_using.html#pbds.using.prereq">Prerequisites</a></span></dt><dt><span class="section"><a href="policy_data_structures_using.html#pbds.using.organization">Organization</a></span></dt><dt><span class="section"><a href="policy_data_structures_using.html#pbds.using.tutorial">Tutorial</a></span></dt><dd><dl><dt><span class="section"><a href="policy_data_structures_using.html#pbds.using.tutorial.basic">Basic Use</a></span></dt><dt><span class="section"><a href="policy_data_structures_using.html#pbds.using.tutorial.configuring">
	    Configuring via Template Parameters
	  </a></span></dt><dt><span class="section"><a href="policy_data_structures_using.html#pbds.using.tutorial.traits">
	    Querying Container Attributes
	  </a></span></dt><dt><span class="section"><a href="policy_data_structures_using.html#pbds.using.tutorial.point_range_iteration">
	    Point and Range Iteration
	  </a></span></dt></dl></dd><dt><span class="section"><a href="policy_data_structures_using.html#pbds.using.examples">Examples</a></span></dt><dd><dl><dt><span class="section"><a href="policy_data_structures_using.html#pbds.using.examples.basic">Intermediate Use</a></span></dt><dt><span class="section"><a href="policy_data_structures_using.html#pbds.using.examples.query">Querying with <code class="classname">container_traits</code> </a></span></dt><dt><span class="section"><a href="policy_data_structures_using.html#pbds.using.examples.container">By Container Method</a></span></dt><dd><dl><dt><span class="section"><a href="policy_data_structures_using.html#pbds.using.examples.container.hash">Hash-Based</a></span></dt><dt><span class="section"><a href="policy_data_structures_using.html#pbds.using.examples.container.branch">Branch-Based</a></span></dt><dt><span class="section"><a href="policy_data_structures_using.html#pbds.using.examples.container.priority_queue">Priority Queues</a></span></dt></dl></dd></dl></dd></dl></dd><dt><span class="section"><a href="policy_data_structures_design.html">Design</a></span></dt><dd><dl><dt><span class="section"><a href="policy_data_structures_design.html#pbds.design.concepts">Concepts</a></span></dt><dd><dl><dt><span class="section"><a href="policy_data_structures_design.html#pbds.design.concepts.null_type">Null Policy Classes</a></span></dt><dt><span class="section"><a href="policy_data_structures_design.html#pbds.design.concepts.associative_semantics">Map and Set Semantics</a></span></dt><dd><dl><dt><span class="section"><a href="policy_data_structures_design.html#concepts.associative_semantics.set_vs_map">
	    Distinguishing Between Maps and Sets
	  </a></span></dt><dt><span class="section"><a href="policy_data_structures_design.html#concepts.associative_semantics.multi">Alternatives to <code class="classname">std::multiset</code> and <code class="classname">std::multimap</code></a></span></dt></dl></dd><dt><span class="section"><a href="policy_data_structures_design.html#pbds.design.concepts.iterator_semantics">Iterator Semantics</a></span></dt><dd><dl><dt><span class="section"><a href="policy_data_structures_design.html#concepts.iterator_semantics.point_and_range">Point and Range Iterators</a></span></dt><dt><span class="section"><a href="policy_data_structures_design.html#concepts.iterator_semantics.both">Distinguishing Point and Range Iterators</a></span></dt><dt><span class="section"><a href="policy_data_structures_design.html#pbds.design.concepts.invalidation">Invalidation Guarantees</a></span></dt></dl></dd><dt><span class="section"><a href="policy_data_structures_design.html#pbds.design.concepts.genericity">Genericity</a></span></dt><dd><dl><dt><span class="section"><a href="policy_data_structures_design.html#concepts.genericity.tag">Tag</a></span></dt><dt><span class="section"><a href="policy_data_structures_design.html#concepts.genericity.traits">Traits</a></span></dt></dl></dd></dl></dd><dt><span class="section"><a href="policy_data_structures_design.html#pbds.design.container">By Container</a></span></dt><dd><dl><dt><span class="section"><a href="policy_data_structures_design.html#pbds.design.container.hash">hash</a></span></dt><dd><dl><dt><span class="section"><a href="policy_data_structures_design.html#container.hash.interface">Interface</a></span></dt><dt><span class="section"><a href="policy_data_structures_design.html#container.hash.details">Details</a></span></dt></dl></dd><dt><span class="section"><a href="policy_data_structures_design.html#pbds.design.container.tree">tree</a></span></dt><dd><dl><dt><span class="section"><a href="policy_data_structures_design.html#container.tree.interface">Interface</a></span></dt><dt><span class="section"><a href="policy_data_structures_design.html#container.tree.details">Details</a></span></dt></dl></dd><dt><span class="section"><a href="policy_data_structures_design.html#pbds.design.container.trie">Trie</a></span></dt><dd><dl><dt><span class="section"><a href="policy_data_structures_design.html#container.trie.interface">Interface</a></span></dt><dt><span class="section"><a href="policy_data_structures_design.html#container.trie.details">Details</a></span></dt></dl></dd><dt><span class="section"><a href="policy_data_structures_design.html#pbds.design.container.list">List</a></span></dt><dd><dl><dt><span class="section"><a href="policy_data_structures_design.html#container.list.interface">Interface</a></span></dt><dt><span class="section"><a href="policy_data_structures_design.html#container.list.details">Details</a></span></dt></dl></dd><dt><span class="section"><a href="policy_data_structures_design.html#pbds.design.container.priority_queue">Priority Queue</a></span></dt><dd><dl><dt><span class="section"><a href="policy_data_structures_design.html#container.priority_queue.interface">Interface</a></span></dt><dt><span class="section"><a href="policy_data_structures_design.html#container.priority_queue.details">Details</a></span></dt></dl></dd></dl></dd></dl></dd><dt><span class="section"><a href="policy_based_data_structures_test.html">Testing</a></span></dt><dd><dl><dt><span class="section"><a href="policy_based_data_structures_test.html#pbds.test.regression">Regression</a></span></dt><dt><span class="section"><a href="policy_based_data_structures_test.html#pbds.test.performance">Performance</a></span></dt><dd><dl><dt><span class="section"><a href="policy_based_data_structures_test.html#performance.hash">Hash-Based</a></span></dt><dd><dl><dt><span class="section"><a href="policy_based_data_structures_test.html#performance.hash.text_find">
	  Text <code class="function">find</code>
	</a></span></dt><dt><span class="section"><a href="policy_based_data_structures_test.html#performance.hash.int_find">
	  Integer <code class="function">find</code>
	</a></span></dt><dt><span class="section"><a href="policy_based_data_structures_test.html#performance.hash.int_subscript_find">
	  Integer Subscript <code class="function">find</code>
	</a></span></dt><dt><span class="section"><a href="policy_based_data_structures_test.html#performance.hash.int_subscript_insert">
	  Integer Subscript <code class="function">insert</code>
	</a></span></dt><dt><span class="section"><a href="policy_based_data_structures_test.html#performance.hash.zlob_int_find">
	  Integer <code class="function">find</code> with Skewed-Distribution
	</a></span></dt><dt><span class="section"><a href="policy_based_data_structures_test.html#performance.hash.erase_mem">
	  Erase Memory Use
	</a></span></dt></dl></dd><dt><span class="section"><a href="policy_based_data_structures_test.html#performance.branch">Branch-Based</a></span></dt><dd><dl><dt><span class="section"><a href="policy_based_data_structures_test.html#performance.branch.text_insert">
	  Text <code class="function">insert</code>
	</a></span></dt><dt><span class="section"><a href="policy_based_data_structures_test.html#performance.branch.text_find">
	  Text <code class="function">find</code>
	</a></span></dt><dt><span class="section"><a href="policy_based_data_structures_test.html#performance.branch.text_lor_find">
	  Text <code class="function">find</code> with Locality-of-Reference
	</a></span></dt><dt><span class="section"><a href="policy_based_data_structures_test.html#performance.branch.split_join">
	  <code class="function">split</code> and <code class="function">join</code>
	</a></span></dt><dt><span class="section"><a href="policy_based_data_structures_test.html#performance.branch.order_statistics">
	  Order-Statistics
	</a></span></dt></dl></dd><dt><span class="section"><a href="policy_based_data_structures_test.html#performance.multimap">Multimap</a></span></dt><dd><dl><dt><span class="section"><a href="policy_based_data_structures_test.html#performance.multimap.text_find_small">
	  Text <code class="function">find</code> with Small Secondary-to-Primary Key Ratios
	</a></span></dt><dt><span class="section"><a href="policy_based_data_structures_test.html#performance.multimap.text_find_large">
	  Text <code class="function">find</code> with Large Secondary-to-Primary Key Ratios
	</a></span></dt><dt><span class="section"><a href="policy_based_data_structures_test.html#performance.multimap.text_insert_small">
	  Text <code class="function">insert</code> with Small
	  Secondary-to-Primary Key Ratios
	</a></span></dt><dt><span class="section"><a href="policy_based_data_structures_test.html#performance.multimap.text_insert_large">
	  Text <code class="function">insert</code> with Small
	  Secondary-to-Primary Key Ratios
	</a></span></dt><dt><span class="section"><a href="policy_based_data_structures_test.html#performance.multimap.text_insert_mem_small">
	  Text <code class="function">insert</code> with Small
	  Secondary-to-Primary Key Ratios Memory Use
	</a></span></dt><dt><span class="section"><a href="policy_based_data_structures_test.html#performance.multimap.text_insert_mem_large">
	  Text <code class="function">insert</code> with Small
	  Secondary-to-Primary Key Ratios Memory Use
	</a></span></dt></dl></dd><dt><span class="section"><a href="policy_based_data_structures_test.html#performance.priority_queue">Priority Queue</a></span></dt><dd><dl><dt><span class="section"><a href="policy_based_data_structures_test.html#performance.priority_queue.text_push">
	  Text <code class="function">push</code>
	</a></span></dt><dt><span class="section"><a href="policy_based_data_structures_test.html#performance.priority_queue.text_push_pop">
	  Text <code class="function">push</code> and <code class="function">pop</code>
	</a></span></dt><dt><span class="section"><a href="policy_based_data_structures_test.html#performance.priority_queue.int_push">
	  Integer <code class="function">push</code>
	</a></span></dt><dt><span class="section"><a href="policy_based_data_structures_test.html#performance.priority_queue.int_push_pop">
	  Integer <code class="function">push</code>
	</a></span></dt><dt><span class="section"><a href="policy_based_data_structures_test.html#performance.priority_queue.text_pop">
	  Text <code class="function">pop</code> Memory Use
	</a></span></dt><dt><span class="section"><a href="policy_based_data_structures_test.html#performance.priority_queue.text_join">
	  Text <code class="function">join</code>
	</a></span></dt><dt><span class="section"><a href="policy_based_data_structures_test.html#performance.priority_queue.text_modify_up">
	  Text <code class="function">modify</code> Up
	</a></span></dt><dt><span class="section"><a href="policy_based_data_structures_test.html#performance.priority_queue.text_modify_down">
	  Text <code class="function">modify</code> Down
	</a></span></dt></dl></dd><dt><span class="section"><a href="policy_based_data_structures_test.html#pbds.test.performance.observations">Observations</a></span></dt><dd><dl><dt><span class="section"><a href="policy_based_data_structures_test.html#observations.associative">Associative</a></span></dt><dt><span class="section"><a href="policy_based_data_structures_test.html#observations.priority_queue">Priority_Queue</a></span></dt></dl></dd></dl></dd></dl></dd><dt><span class="section"><a href="policy_data_structures_ack.html">Acknowledgments</a></span></dt><dt><span class="bibliography"><a href="policy_data_structures.html#pbds.biblio">Bibliography</a></span></dt></dl></dd><dt><span class="chapter"><a href="ext_containers.html">22. HP/SGI Extensions</a></span></dt><dd><dl><dt><span class="section"><a href="ext_containers.html#manual.ext.containers.sgi">Backwards Compatibility</a></span></dt><dt><span class="section"><a href="ext_sgi.html">Deprecated</a></span></dt></dl></dd><dt><span class="chapter"><a href="ext_utilities.html">23. Utilities</a></span></dt><dt><span class="chapter"><a href="ext_algorithms.html">24. Algorithms</a></span></dt><dt><span class="chapter"><a href="ext_numerics.html">25. Numerics</a></span></dt><dt><span class="chapter"><a href="ext_iterators.html">26. Iterators</a></span></dt><dt><span class="chapter"><a href="ext_io.html">27. Input and Output</a></span></dt><dd><dl><dt><span class="section"><a href="ext_io.html#manual.ext.io.filebuf_derived">Derived filebufs</a></span></dt></dl></dd><dt><span class="chapter"><a href="ext_demangling.html">28. Demangling</a></span></dt><dt><span class="chapter"><a href="ext_concurrency.html">29. Concurrency</a></span></dt><dd><dl><dt><span class="section"><a href="ext_concurrency.html#manual.ext.concurrency.design">Design</a></span></dt><dd><dl><dt><span class="section"><a href="ext_concurrency.html#manual.ext.concurrency.design.threads">Interface to Locks and Mutexes</a></span></dt><dt><span class="section"><a href="ext_concurrency.html#manual.ext.concurrency.design.atomics">Interface to Atomic Functions</a></span></dt></dl></dd><dt><span class="section"><a href="ext_concurrency_impl.html">Implementation</a></span></dt><dd><dl><dt><span class="section"><a href="ext_concurrency_impl.html#manual.ext.concurrency.impl.atomic_fallbacks">Using Built-in Atomic Functions</a></span></dt><dt><span class="section"><a href="ext_concurrency_impl.html#manual.ext.concurrency.impl.thread">Thread Abstraction</a></span></dt></dl></dd><dt><span class="section"><a href="ext_concurrency_use.html">Use</a></span></dt></dl></dd></dl></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="concurrency.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="index.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="ext_preface.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 15. 
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